[PATCH] fs: Avoid userspace mounting anon_inodefs filesystem

[Jan Kara <jack@xxxxxxx>]

anon_inodefs filesystem is a kernel internal filesystem userspace
shouldn't mess with. Remove registration of it so userspace cannot
even try to mount it (which would fail anyway because the filesystem is
MS_NOUSER).

This fixes an oops triggered by trinity when it tried mounting
anon_inodefs which overwrote anon_inode_inode pointer while other CPU
has been in anon_inode_getfile() between ihold() and d_instantiate().
Thus effectively creating dentry pointing to an inode without holding a
reference to it.

Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/anon_inodes.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 24084732b1d0..4b4543b8b894 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -177,9 +177,6 @@ static int __init anon_inode_init(void)
 {
        int error;
 
-       error = register_filesystem(&anon_inode_fs_type);
-       if (error)
-               goto err_exit;
        anon_inode_mnt = kern_mount(&anon_inode_fs_type);
        if (IS_ERR(anon_inode_mnt)) {
                error = PTR_ERR(anon_inode_mnt);
-- 
1.8.1.4